Dual PC stream audio setup with single XLR microphone

I decided to go over my audio setup since people have been asking about it. Parts used:
Mixer:
http://www.amazon.com/Behringer-Q802USB-8-Channel-Mixer/dp/B008O517IC/ref=sr_1_1?ie=UTF8&qid=1437952151&sr=8-1&keywords=behringer+xenyx+q802+usb